BUG#11684 fix.

Repair crashes mysql when table has fulltext index.


myisam/sort.c:
  Use static ft_buf instead of dynamic mergebuf. Latter could be NULL if record has long words.
mysql-test/r/fulltext.result:
  Test case for BUG#11684 - repair crashes mysql when table has fulltext index.
mysql-test/t/fulltext.test:
  Test case for BUG#11684 - repair crashes mysql when table has fulltext index.

myisam/sort.c

@@ -532,11 +532,13 @@ int thr_write_keys(MI_SORT_PARAM *sort_param)
 
       while (!got_error &&
 	     !my_b_read(&sinfo->tempfile_for_exceptions,(byte*)&key_length,
-			sizeof(key_length)) &&
-	     !my_b_read(&sinfo->tempfile_for_exceptions,(byte*)mergebuf,
-			(uint) key_length))
+			sizeof(key_length)))
       {
-	if (_mi_ck_write(info,sinfo->key,(uchar*) mergebuf,
+        byte ft_buf[HA_FT_MAXLEN + HA_FT_WLEN + 10];
+        if (key_length > sizeof(ft_buf) ||
+            my_b_read(&sinfo->tempfile_for_exceptions, (byte*)ft_buf,
+                      (uint)key_length) ||
+            _mi_ck_write(info, sinfo->key, (uchar*)ft_buf,
                          key_length - info->s->rec_reflength))
           got_error=1;
       }

mysql-test/r/fulltext.result

@@ -321,3 +321,11 @@ SELECT MATCH(a) AGAINST ('nosuchword') FROM t1;
 MATCH(a) AGAINST ('nosuchword')
 0
 DROP TABLE t1;
+CREATE TABLE t1 (a VARCHAR(30), FULLTEXT(a));
+INSERT INTO t1 VALUES('bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb');
+SET myisam_repair_threads=2;
+REPAIR TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	repair	status	OK
+SET myisam_repair_threads=@@global.myisam_repair_threads;
+DROP TABLE t1;

mysql-test/t/fulltext.test

@@ -260,3 +260,14 @@ CREATE TABLE t1 ( a TEXT, FULLTEXT (a) );
 INSERT INTO t1 VALUES ('testing ft_nlq_find_relevance');
 SELECT MATCH(a) AGAINST ('nosuchword') FROM t1;
 DROP TABLE t1;
+
+#
+# BUG#11684 - repair crashes mysql when table has fulltext index
+#
+
+CREATE TABLE t1 (a VARCHAR(30), FULLTEXT(a));
+INSERT INTO t1 VALUES('bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb');
+SET myisam_repair_threads=2;
+REPAIR TABLE t1;
+SET myisam_repair_threads=@@global.myisam_repair_threads;
+DROP TABLE t1;